JP2019129372A - Base station, communication method, and communication system - Google Patents

Abstract

To improve the probability in which communication by carrier aggregation can be performed at an important location.SOLUTION: A base station 1 of a wireless communication network includes an information acquisition unit 152 that obtains, a communication terminal 2 capable of communication, first radio wave state information indicating a first radio wave state which is the state of a radio wave received by the communication terminal 2 from one or more candidate base stations which are candidates for the other base station 1 that performs carrier aggregation in conjunction with the base station 1, and a selection unit 153 that selects a priority base station as a linked base station that performs carrier aggregation in conjunction when a priority base station including a predetermined position in a communicable range is included in the one or more candidate base stations, and a radio wave condition corresponding to the priority base station satisfies a predetermined condition.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a base station of a mobile telephone network, a communication method, and a communication system.

  BACKGROUND Conventionally, a carrier aggregation technique is known that transmits data by combining a plurality of wireless channels. Patent Document 1 discloses a technique for selecting a combination of radio channels to be used from combinations of usable radio frequency bands (hereinafter referred to as radio channels) based on communication quality.

International Publication No. 2017/026334

  By the way, since a large number of people gather at an event venue or a store selling popular products, a large communication capacity is required. In order to secure sufficient communication capacity in such an important place, it is assumed to use a carrier aggregation technique in which a plurality of base stations use available radio channels in combination.

  However, when the base station uses a conventional technique to select a combination of radio channels, a combination of radio channels that can ensure sufficient radio field strength at an important location is selected from the combinations of available radio channels. Not always. As a result, there has been a problem that high-speed communication using multiple wireless channels may not be able to be performed in important places.

  Therefore, the present invention has been made in view of these points, and it is an object of the present invention to improve the probability of being able to perform communication by carrier aggregation using a plurality of radio channels at important places.

  A base station according to a first aspect of the present invention is a base station of a wireless communication network, and from a communication terminal with which the base station can communicate, another base station performing carrier aggregation in conjunction with the base station. An information acquisition unit that acquires first radio wave state information indicating a first radio wave state that is a state of a radio wave received by the communication terminal from one or more candidate base stations that are candidates, and a priority that includes a predetermined position in a communicable range As an interlocked base station that performs carrier aggregation in an interlocked manner when the base station is included in the one or more candidate base stations and the first radio wave condition corresponding to the priority base station satisfies a predetermined condition A selection unit that selects the priority base station.

  The base station further includes a storage unit that stores one or more candidate base stations, and the information acquisition unit communicates information for identifying the one or more candidate base stations stored in the storage unit. You may transmit to a terminal.

  The selection unit may select, as the linked base station, an adjacent base station installed at a position closest to the base station, when the priority base station is not included in the one or more candidate base stations. . The selection unit preferentially selects a priority base station having a large area where a communicable range overlaps a communicable range of the base station, out of one or more of the priority base stations including the predetermined position in the communicable range. It may be selected as a linked base station.

  The selection unit may preferentially select a priority base station with a small number of terminals in communication as the linked base station among one or more of the priority base stations including the predetermined position in a communicable range.

  The information acquisition unit further acquires position information indicating the position of the communication terminal, and the selection unit is configured as the linked base station when the position of the communication terminal is within a predetermined range from a predetermined position. A priority base station may be selected.

  The selection unit may determine whether to select the preferred base station as the interlocked base station based on the time when the position of the communication terminal is within a predetermined range from a predetermined position.

  The information acquisition unit acquires second radio wave state information indicating a radio wave state received by the communication terminal from the base station, and the selection unit includes a first radio wave state indicated by the first radio wave state information, The interlocked base station may be selected based on the relationship with the second radio wave state indicated by the second radio wave state information. The selection unit selects, for example, a priority base station in which a difference between the radio wave strength indicated by the first radio wave state information and the radio wave strength indicated by the second radio wave state information is within a predetermined threshold.

  The base station further includes a data transmission unit that transmits a part of the data received from the network side device to the interlocking base station, and the data transmission unit is configured to transmit the first radio wave state and the second radio wave state. The amount of data to be transmitted to the associated base station may be determined based on the relationship.

  A communication method according to a second aspect of the present invention is a computer-executed communication terminal capable of communicating with a base station of a wireless communication network, and another base station candidate that performs carrier aggregation in conjunction with the base station. Acquiring a first radio wave state information indicating a first radio wave state which is a state of a radio wave received by the communication terminal from one or more candidate base stations, and a priority base station including a predetermined position in a communicable range The priority base station as a linked base station that performs carrier aggregation in conjunction when one or more candidate base stations are included and the first radio wave condition corresponding to the priority base station satisfies a predetermined condition. Selecting.

  A communication system according to a third aspect of the present invention comprises: a plurality of base stations of a wireless communication network; and a communication terminal capable of communicating with the wireless communication network, wherein the main base station is one of the plurality of base stations. Of the radio wave received by the communication terminal from a communication terminal with which the main base station can communicate, from one or more candidate base stations that are candidates for another base station that performs carrier aggregation in conjunction with the main base station. An information acquisition unit that acquires first radio wave state information indicating a first radio wave state that is a state, and a priority base station that includes a predetermined position in a communicable range is included in the one or more candidate base stations, and A selector configured to select the preferred base station as a linked base station to perform carrier aggregation interlockedly when the first radio wave condition corresponding to the preferred base station satisfies a predetermined condition; and data received from the network side device Before distributing A communication control unit for transmitting to a priority base station and the communication terminal, wherein the priority base station is data selected for the communication terminal from the main base station when the priority base station is selected as the interlocking base station Is transferred to the communication terminal.

  According to the present invention, it is possible to improve the probability of being able to perform communication by carrier aggregation using a plurality of wireless channels at important places.

It is a figure for demonstrating the outline | summary of the communication system which concerns on this Embodiment. It is a figure which shows the structure of a base station. It is a figure which shows an example of a candidate base station list. It is a figure for demonstrating a candidate base station. It is a flowchart which shows the flow of a process of the operation | movement which a selection part selects an interlocking | linkage base station. It is a figure which shows an example of the communication sequence in a communication system.

[Overview of Communication System S]
FIG. 1 is a diagram for explaining an outline of a communication system S according to the present embodiment. In FIG. 1, a plurality of base stations 1 (base station 1M and base station 1S), communication terminal 2, and S-GW 3 are shown. The base station 1 is, for example, an eNB (evolved Node B) that is a base station of an LTE (Long Term Evolution) network. The communication terminal 2 is a terminal capable of wireless communication with the base station 1 and is, for example, a smartphone or a tablet.

  The S-GW 3 is, for example, an S-GW (Serving Gateway) of the LTE network. The S-GW 3 is a network-side facility for relaying data in a core network that is a communication network connecting a plurality of base stations 1. The S-GW 3 transfers data received from an external network such as the Internet to the base station 1 via another network-side facility such as a P-GW (PDN Gateway) or externally transmits data transmitted by the base station 1. Or transfer to the network.

  Base station 1 supports carrier aggregation that transmits and receives data to and from communication terminal 2 simultaneously using a plurality of wireless channels with different frequencies so that communication terminal 2 can perform high-speed wireless data communication. ing. Specifically, the base station 1 supports carrier aggregation in which data is transmitted to the communication terminal 2 using a plurality of radio channels in conjunction with another base station 1 that has been paired.

  The mobile operator sets in advance another base station 1 that can be paired with the base station 1. When it is necessary to perform carrier aggregation, each base station 1 selects, from among one or more base stations included in the candidate base station list, the base station 1 that performs carrier aggregation in conjunction. The mobile phone operator may determine the base stations to be included in the candidate base stations in association with the frequency used by the base station 1, or may determine the frequencies available to each candidate base station.

  The base station 1M in FIG. 1 is a base station that has started communication with the communication terminal 2. In the following description, the base station 1M that has started communication with the communication terminal 2 may be referred to as a main base station. The base station 1S is a base station selected by the base station 1M as a base station that performs carrier aggregation in conjunction with the base station 1M. In the following description, the base station 1S may be referred to as a linked base station. Hereinafter, an outline of the procedure until the base station 1M selects the base station 1S will be described.

  First, the base station 1M transmits the candidate base station list stored in advance in the storage medium to the communication terminal 2 (S1). The communication terminal 2 measures the reception intensity of the radio wave transmitted by one or more base stations 1 included in the received candidate base station list (S2). The communication terminal 2 notifies the base station 1M of the measurement result (S3).

  Subsequently, the base station 1M selects another base station 1 (that is, a linked base station) that performs carrier aggregation in linkage (S4). At this time, the base station 1M selects another base station 1 that includes a predetermined position in the vicinity of the communication terminal 2 in the communicable range and that has a reception intensity at the communication terminal 2 equal to or higher than a threshold value. The predetermined position is an important position where there is a high need to improve the wireless data reception environment, for example, a position where a large number of people gather, such as an event hall, a shopping center, or a store where new products are planned to be sold. It is. In the following description, a predetermined position may be referred to as an important position.

  Here, it is assumed that an important position is included in the communicable range of the base station 1S and the base station 1M selects the base station 1S. The base station 1M transmits, to the base station 1S, a message for requesting the setting of data distribution to the communication terminal 2 by carrier aggregation to the base station 1S (S5). The base station 1S having received the message performs setting for performing carrier aggregation in conjunction with the base station 1M, whereby the base station 1S can transfer the data received from the base station 1M to the communication terminal 2 become.

  Further, the base station 1M transmits, to the communication terminal 2, a message for requesting the communication terminal 2 to receive data from the base station 1S by carrier aggregation (S6). Upon receiving the message, the communication terminal 2 can process the data received from the base station 1M and the base station 1S in association with each other.

  Thereafter, when the S-GW 3 distributes data to the base station 1M (S7), the base station 1M divides the received data into two data. The base station 1M transmits the first data, which is a part of the data, to the base station 1S (S8), and transmits the remaining second data to the communication terminal 2 (S9). By the above procedure, the communication terminal 2 can receive data at high speed by carrier aggregation at important positions. In this way, in the communication system S, the communication terminal 2 can receive data at high speed, and can increase the communicable volume at important positions where a large amount of communication capacity is required.

  In FIG. 1, although the base station 1M transmits the candidate base station list to the communication terminal 2, the communication terminal 2 acquires the candidate base station list from the server of the mobile phone carrier, or the position in advance. The candidate base station may be stored in association with the.

[Configuration of base station 1]
Next, the configuration of the base station 1 will be described. FIG. 2 is a diagram illustrating the configuration of the base station 1. The base station 1 includes a terminal communication unit 11, a base station communication unit 12, a network side communication unit 13, a storage unit 14, and a control unit 15.

  The terminal communication unit 11 includes a communication module for performing wireless communication with the communication terminal 2. The terminal communication unit 11 transmits a radio wave of a frequency that can be used for communication with the communication terminal 2 and receives a radio wave transmitted by the communication terminal 2.

  The base station communication unit 12 includes a communication module for transmitting and receiving data to and from another base station 1. The base station communication unit 12 transmits a message such as a setting request to another base station 1 or distributes a part of the data received from the S-GW 3 and transmits it to the other base station 1.

  The network side communication unit 13 includes a communication module for transmitting and receiving data to and from the S-GW 3. The network side communication unit 13 transmits data to be transmitted to the external network to the S-GW 3 and receives data transmitted from the external network from the S-GW 3.

  The storage unit 14 is a storage medium such as a read only memory (ROM), a random access memory (RAM), and a hard disk. The storage unit 14 stores a program that the control unit 15 executes. Further, the storage unit 14 stores a candidate base station list including information on candidate base stations that can perform carrier aggregation pairing. Moreover, the memory | storage part 14 has memorize | stored the latitude and longitude information of an important position, for example as position information for pinpointing the important position set by the mobile telephone provider.

  FIG. 3 is a diagram showing an example of a candidate base station list. FIG. 4 is a diagram for describing a candidate base station. The candidate base station list shown in FIG. 3 is stored in storage unit 14 of base station 1A in FIG. 4, and base station 1B, base station 1C, base station 1C as a candidate base station with which base station 1A can perform pairing. Information on the station 1D, the base station 1E and the base station 1F is included.

  In the candidate base station list, the candidate base station name, the position (latitude / longitude information) of the candidate base station, a flag indicating whether it is an attached station or not, the communicable range of the base station 1A and the candidate base station The overlapping area with the coverage area is associated. The co-located station is a base station installed in the vicinity of the base station 1A, and for example, a base station whose communicable range is included in the communicable range of the base station 1A like the base station 1B in FIG. It is. In FIG. 3, “◯” indicates that the station is a side station, and “X” indicates that the station is not a side station.

  As the overlapping area, for example, a value measured in advance by a mobile phone operator who manages the base station 1 is stored. In the example illustrated in FIG. 4, the base station having the communicable range that overlaps with the communicable range of the base station 1A in the widest area is the base station 1C. The base station 1 may specify its own communicable range based on position information received from a number of communicable communication terminals 2 and may transmit the specified communicable range to other base stations 1. The plurality of base stations 1 may calculate the overlapping area based on the communicable range received from another base station 1 and update the value of the overlapping area in the candidate base station list of the storage unit 14 in real time.

  Returning to FIG. 2, the controller 15 will be described. The control unit 15 includes, for example, a CPU (Central Processing Unit), and functions as a communication control unit 151, an information acquisition unit 152, and a selection unit 153 by executing a program stored in the storage unit 14.

  The communication control unit 151 manages communication processing in the base station 1. The communication control unit 151 transmits and receives data to and from the communication terminal 2 via the terminal communication unit 11. The communication control unit 151 transmits and receives data to and from another base station 1 via the base station communication unit 12. The communication control unit 151 transmits and receives data to and from the S-GW 3 via the network communication unit 13.

  For example, when receiving the measurement result of the reception intensity of the radio wave transmitted from the base station 1 in the communication terminal 2 received via the terminal communication unit 11, the communication control unit 151 inputs the received measurement result to the information acquisition unit 152 To do. Further, the communication control unit 151 transmits a setting request via the base station communication unit 12 to another base station 1 that performs carrier aggregation in conjunction with the communication control unit 151. Moreover, the communication control part 151 functions as a data transmission part which transmits a part of data received from S-GW3 which is a network side apparatus to a cooperation base station. When the communication control unit 151 receives data from the S-GW 3 via the network communication unit 13, the communication control unit 151 receives the received data via the terminal communication unit 11 and the base station communication unit 12, and the communication terminal 2 and other base stations 1. And distribute to. Details of the process in which the communication control unit 151 performs data transmission by carrier aggregation will be described later.

  The information acquisition unit 152 acquires information necessary for the selection unit 153 to select another base station 1 that performs carrier aggregation in conjunction with the information acquisition unit 152. The information acquisition unit 152 receives, from the communication terminal 2 that can communicate with the base station 1 (for example, the base station 1M in FIG. 1), another base station 1 (for example, in FIG. First radio wave state information indicating a radio wave state received by the communication terminal 2 is acquired from one or more candidate base stations (for example, base station 1B to base station 1F in FIG. 4) that are candidates for the base station 1S). In addition, the information acquisition unit 152 acquires second radio wave state information indicating a radio wave state received by the communication terminal 2 from the communicating base station 1. The information acquisition unit 152 notifies the selection unit 153 of the acquired first radio wave state information and second radio wave state information.

  The information acquisition unit 152 acquires a candidate base station list as information for specifying one or more candidate base stations stored in the storage unit 14 in order to acquire the first radio wave state information from the communication terminal 2. 2 to send. The information acquisition unit 152, for example, displays a candidate base station list in response to the start of an application requiring high-speed wireless data communication in the communication terminal 2 and the base station 1 receiving a message requesting high-speed wireless data communication. Send to. The information acquisition unit 152 may include the candidate base station list in the response transmitted to the communication terminal 2 when the communication terminal 2 makes a connection request to the base station 1 such as when the communication terminal 2 performs a handover. Good. Further, the base station 1 may transmit the candidate base station list during the attach process in which the communication terminal 2 is turned on and the position of the communication terminal 2 is registered.

  The information acquisition unit 152 may acquire information for specifying an important position input on the computer by the mobile phone operator via the terminal communication unit 11 and store the acquired information in the storage unit 14. For example, the information acquisition unit 152 may receive information for specifying an important position together with a candidate base station list received from a computer of a mobile phone operator. The information acquiring unit 152 acquires information for specifying the important position input in the predetermined number or more of the communication terminals 2 other than the mobile phone carrier's computer, and stores the acquired information in the storage unit 14. Good.

  The selecting unit 153 is interlocked when the priority base station including the predetermined important position in the communicable range is included in one or more candidate base stations, and the radio wave state corresponding to the priority base station satisfies the predetermined condition. Then, a priority base station is selected as a linked base station that executes carrier aggregation. Hereinafter, the details of the operation in which the selecting unit 153 selects a linked base station will be described.

[Flow of processing to select linked base station]
FIG. 5 is a flowchart showing a process flow of an operation in which the selecting unit 153 selects a linked base station. The flowchart shown in FIG. 5 starts when, for example, application software that requires high-speed wireless data communication is activated in the communication terminal 2 and the base station 1 receives a message requesting high-speed wireless data communication.

  First, the selection unit 153 refers to the candidate base station list stored in the storage unit 14 and the position information of the important position (S11), and determines whether there is a priority base station that is a candidate base station including the important position. Is determined (S12).

  If selection section 153 determines that there is a priority base station (YES in S12), it refers to the first radio wave state information input from information acquisition section 152, and the state of the radio wave received by communication terminal 2 from the priority base station Is judged whether or not is good (S12). The selection unit 153 determines, for example, whether the intensity of the radio wave received by the communication terminal 2 is equal to or greater than a threshold.

  If the selection unit 153 determines that the state of the radio wave received by the communication terminal 2 from the priority base station is good (YES in S12), the selection unit 153 selects the priority base station as a linked base station (S13). When there are a plurality of priority base stations, the selection unit 153 selects, for example, the priority base station having the highest received radio wave intensity at the communication terminal 2 as the linked base station. If the selection unit 153 determines in S12 that the state of the radio waves from all the priority base stations is not good, the selection unit 153 advances the process to S14. Note that the selection unit 153 may determine which priority base station is selected as the linked base station based on the frequency of the radio wave used by the communication terminal 2.

  If selection section 153 determines that the priority base station including the important position is not included in the candidate base station list in S11 (NO in S12), or the radio wave state that communication terminal 2 received from the priority base station in S12 Is determined to be not good, it is determined whether the side station is included in the candidate base station list (S14). When selection unit 153 determines that the co-located station is included in the candidate base station list (YES in S14), it determines whether or not the state of the radio wave received by communication terminal 2 from the co-located station is good ( S15).

  If the selecting unit 153 determines that the state of the radio wave received by the communication terminal 2 from the co-located station is good, the selecting unit 153 selects the co-located station as a linked base station (S16). That is, the selection unit 153 selects a base station installed at a position closest to the base station 1 as a linked base station when the priority base station is not included in one or more candidate base stations. If the selection unit 153 determines that the state of the radio wave received from the station by the communication terminal 2 is not good, the selection unit 153 proceeds to S17.

  If selection unit 153 determines that the co-located station is not included in the candidate base station list in S14, or if it is determined that the state of the radio wave received by communications terminal 2 from the co-located station is not good in S15, communication terminal 2 It is determined whether there is any other candidate base station in which the state of the radio wave received is good (S17).

  If the selecting unit 153 determines that there is a candidate base station with a good radio wave condition, it links the base station 1 with the largest overlapping area with its own base station 1 among the candidate base stations with a good radio wave condition. The base station is selected (S18). That is, among the one or more priority base stations including the predetermined important position in the communicable range, selection unit 153 preferentially links the priority base stations having a large area in which the communicable range overlaps with the communicable range of the base station. Select as base station. When the selecting unit 153 preferentially selects another base station 1 with a large overlapping area, it is possible to perform carrier aggregation in an area as large as possible.

  When it is determined that there is no candidate base station in which the state of the radio wave received by the communication terminal 2 is good in S17 (NO in S17), the selection unit 153 cancels carrier aggregation without selecting a linked base station (S19) .

[Other Conditions for Selection Unit 153 to Select Linked Base Station]
The selection unit 153 may preferentially select a priority base station with a small number of communication terminals 2 in communication as a linked base station among one or more priority base stations including a predetermined important position in a communicable range. . By doing this, the probability that the communication channel under better conditions can be used for carrier aggregation is increased.

  In addition, based on the position information indicating the position of the communication terminal 2 acquired by the information acquiring unit 152, the selecting unit 153 determines that the interlocking base station is in the case where the position of the communication terminal 2 is within the predetermined range from the predetermined important position. A priority base station may be selected as By doing this, when the probability that the communication terminal 2 reaches the important position is relatively high, the selection unit 153 performs carrier aggregation in conjunction with another base station 1 that includes the important position in the communicable range. As a result, the communication terminal 2 can perform high-speed wireless data communication at the important position. The timing at which the communication terminal 2 transmits the position information is arbitrary, but the position information may be transmitted on the condition that the communication terminal 2 is connected to a specific main base station that includes the important position in the communicable range. Good.

  Further, the selection unit 153 may determine whether or not to select the priority base station as the interlocking base station based on the time when the position of the communication terminal 2 is within a predetermined range from the predetermined important position. For example, when the communication terminal 2 is close to the important position for a time longer than the time when the communication terminal 2 can be considered to be highly likely to move to the important position, the selection unit 153 selects a priority base station that includes the important position in the communicable range. Select as linked base station. On the other hand, selection section 153 selects the preferred base station including the important position in the communicable range, as long as communication terminal 2 is close to the important position less than the time that can be considered to only pass near the important position. Do not choose as.

  By doing in this way, the selection part 153 can improve the probability that the base station 1 can perform communication by the carrier aggregation in the communication terminal 2 in an important position. Moreover, when the possibility that the communication terminal 2 goes to an important position is low, carrier aggregation is not performed, so that it is possible to prevent the frequency resources that can be used near the important position from being exhausted. In addition, although the method of determining whether the communication terminal 2 is near the important position is arbitrary, the selection unit 153 is based on, for example, the strength of radio waves received from each of the plurality of base stations 1 by the communication terminal 2. It may be determined whether it is near the important position.

  The selection unit 153 selects the interlocking base station based on the relationship between the first radio wave state indicated by the first radio wave state information acquired by the information acquisition unit 152 from the communication terminal 2 and the second radio wave state indicated by the second radio wave state information. May be selected. For example, the selection unit 153 selects a priority base station in which the difference between the radio wave intensity indicated by the first radio wave state information and the radio wave intensity indicated by the second radio wave state information is within a predetermined threshold as the interlocking base station. The selection unit 153 may select a priority base station in which the radio wave intensity indicated by the first radio wave state information and the radio wave intensity indicated by the second radio wave state information are equal to or higher than a threshold necessary for good communication as a linked base station.

  By doing this, when the base station 1 performs carrier aggregation and transmits data to the communication terminal 2, the selection unit 153 determines the data transmission rate at the time of transmitting data from the main base station to the communication terminal 2 and It is possible to prevent an increase in the difference with the data transmission rate when transmitting data from the interlocked base station to the communication terminal 2. As a result, since one communication route does not become a bottleneck, high-speed wireless data communication can be realized.

  In addition, when the strength of the radio wave received by the communication terminal 2 from the base station 1 fluctuates by a predetermined amount or more, the selection unit 153 has a high possibility that the communication terminal 2 is moving, and thus the carrier aggregation is performed. It may be determined not to be performed. In this case, the selecting unit 153 selects the interlocking base station on the condition that the fluctuation amount of the strength of the radio wave received by the communication terminal 2 from the base station 1 is less than a predetermined amount. By doing this, it is possible to prevent in advance the occurrence of a situation in which communication with the interlocked base station can not be performed immediately after the carrier aggregation is started.

[Communication sequence]
FIG. 6 is a diagram illustrating an example of a communication sequence in the communication system S. First, when application software for performing wireless data communication is activated in the communication terminal 2, the communication terminal 2 transmits a data communication start request to the base station 1A. When the base station 1A receives the data communication start request, the base station 1A transmits a candidate base station list indicating candidate base stations capable of performing carrier aggregation in conjunction with the communication terminal 2.

  The communication terminal 2 measures the intensity of the radio wave transmitted by the candidate base station included in the candidate base station list, and transmits a measurement result indicating the measured radio wave intensity to the base station 1A. The base station 1A selects the base station 1E as an interlocking base station that performs carrier aggregation in conjunction with the procedure described with reference to FIG.

  When the base station 1A selects the base station 1E as the interlocking base station, the base station 1A transmits a request for setting the base station 1E and the communication terminal 2 to perform carrier aggregation in conjunction with each other. When the setting is completed, the base station 1E and the communication terminal 2 transmit a setting completion notification indicating that the setting is completed to the base station 1A.

  When receiving the setting completion notification from the base station 1E and the communication terminal 2, the base station 1A distributes data received from the S-GW 3 thereafter and transmits it to the base station 1E and the communication terminal 2. When distributing data, the communication control unit 151 of the base station 1A may determine the distribution amount based on the state of radio waves that the communication terminal 2 receives from each of the base station 1A and the base station 1E. The communication control unit 151 receives, for example, the state (first radio wave state) of the radio wave that the information acquisition unit 152 receives from the communication terminal 2 and the communication terminal 2 receives from the base station 1E, and the communication terminal 2 receives from the base station 1A. The amount of data to be transmitted to the base station 1E functioning as a linked base station is determined based on the relationship with the state of the radio wave to be transmitted (second radio wave state).

  Specifically, when the first radio wave state is better than the second radio wave state, the communication control unit 151 directly sends the amount of data to be transmitted to the communication terminal 2 via the base station 1E from the base station 1A. The amount is larger than the amount of data transmitted to the communication terminal 2. Conversely, when the second radio wave state is better than the first radio wave state, the communication control unit 151 determines the amount of data transmitted directly from the base station 1A to the communication terminal 2 via the base station 1E. 2 is larger than the amount of data to be transmitted.

  When the first radio wave state and the second radio wave state are included in a predetermined range, the communication control unit 151 transmits the amount of data transmitted directly from the base station 1A to the communication terminal 2 and the base station 1E. The amount of data to be transmitted to the communication terminal 2 is made equal. By doing this, it is possible to prevent the amount of data transmitted using a communication path with a bad radio wave condition from becoming too large, and therefore it is possible to increase the data transmission rate from the base station 1 to 2 as much as possible.

[Effect by base station 1]
As described above, the selection unit 153 of the base station 1 includes a priority base station that includes a predetermined important position in the communicable range in one or more candidate base stations, and the communication terminal 2 from the priority base station When the state of the received radio wave satisfies a predetermined condition, the priority base station is selected as a linked base station that performs carrier aggregation in a linked manner. In this way, when the communication terminal 2 can satisfactorily receive radio waves from the base station 1 including the important position in the communicable range, carrier aggregation using the base station 1 is performed. Wireless data communication speed can be increased.

[Modification]
In the above description, the interlocked base station selected by the selection unit 153 based on the radio wave state received by the communication terminal 2 is used for carrier aggregation in communication with the communication terminal 2 that has notified the base station 1 of the radio wave state. However, the base station 1 may use the selected linked base station for carrier aggregation in communication with other communication terminals 2. In order to do this, the base station 1 causes the storage unit 14 to store the linked base station selected by the selection unit 153.

  The communication control unit 151 stores the interlocking base station in the storage unit 14 after the selection unit 153 stores the interlocking base station, and stores the interlocking base station in the storage unit 14 until the predetermined period elapses, and can receive radio waves from the interlocking base station. When transmitting data, the carrier aggregation using the stored linked base station is performed to transmit the data. Selection unit 153 stores the interlocking base station selected by selection unit 153 in storage unit 14 on condition that the number of communication terminals 2 starting communication within the predetermined range from the important position has become equal to or greater than the predetermined number. You may let them.

  As described above, the base station 1 stores the linked base station selected by the selection unit 153, and then, when performing carrier aggregation, in conjunction with the stored linked base station, the worker of the mobile phone operator Can automatically determine the linked base station without setting the linked base station. As a result, it is possible to reduce the amount of setting work of the linked base station by the mobile phone carrier.

  In addition, the selection unit 153 of the base station 1 acquires information for specifying a candidate base station input by the operator of the mobile phone operator using a computer, and the interlocking base station is automatically acquired based on the acquired information. May be set. When the selecting unit 153 receives information for identifying a candidate base station from an external computer, whether the communication quality is improved by using the candidate base station indicated by the received information as a linked base station Determine. When it is determined that the communication quality is improved, the selection unit 153 sets the candidate base station indicated by the received information as a linked base station, and causes the storage unit 14 to store information on the new linked base station. By doing so, the base station 1 automatically sets the optimum linked base station simply by inputting the candidate base station to the computer by the operator of the mobile phone operator, so that the setting work amount can be reduced. It becomes possible.

  Furthermore, the base station 1 may notify other base stations 1 of the changed content when the linked base station is changed. And the selection part 153 of the base station 1 which received the notification of the changed content may update the base station 1 which self-links based on the content changed in the other base station 1. FIG. In this way, when the linked base station of one base station 1 is changed, it is not necessary for the operator of the mobile phone operator to change the linked base station of the other base station 1. The amount of work can be reduced.

  As mentioned above, although the present invention was explained using an embodiment, the technical scope of the present invention is not limited to the range given in the above-mentioned embodiment, and various modification and change are possible within the range of the gist. is there. For example, a specific embodiment of device distribution and integration is not limited to the above embodiment, and all or a part thereof may be functionally or physically distributed and integrated in any unit. Can do. In addition, new embodiments generated by any combination of a plurality of embodiments are also included in the embodiments of the present invention. The effect of the new embodiment produced by the combination has the effect of the original embodiment.

S communication system 1 base station 2 communication terminal 3 S-GW
11 terminal communication unit 12 base station communication unit 13 network side communication unit 14 storage unit 15 control unit 151 communication control unit 152 information acquisition unit 153 selection unit

Claims (12)

A base station of a wireless communication network,
A state of radio waves received by the communication terminal from one or more candidate base stations that are candidates for other base stations that perform carrier aggregation in conjunction with the base station from a communication terminal capable of communicating with the base station. 1) an information acquisition unit for acquiring first radio wave state information indicating a radio wave state;
When a priority base station that includes a predetermined position in a communicable range is included in the one or more candidate base stations, and the first radio wave state corresponding to the priority base station satisfies a predetermined condition, the base station is linked. A selection unit that selects the priority base station as a linked base station that performs carrier aggregation;
Base station with The base station further comprises a storage unit for storing one or more candidate base stations;
The information acquisition unit transmits information for specifying the one or more candidate base stations stored in the storage unit to a communication terminal;
The base station according to claim 1. When the priority base station is not included in the one or more candidate base stations, the selection unit selects, as the interlocking base station, a side-by-side base station installed at a position closest to the base station,
The base station according to claim 1 or 2. The selection unit preferentially selects a priority base station having a large area where a communicable range overlaps a communicable range of the base station, out of one or more of the priority base stations including the predetermined position in the communicable range. Select as linked base station,
The base station as described in any one of Claim 1 to 3. The selection unit preferentially selects a priority base station with a small number of terminals in communication as the linked base station from among the one or more priority base stations including the predetermined position in a communicable range,
The base station as described in any one of Claim 1 to 3. The information acquisition unit further acquires position information indicating a position of the communication terminal,
The selection unit selects the priority base station as the interlocking base station when the position of the communication terminal is within a predetermined range from a predetermined position;
The base station as described in any one of Claim 1 to 5. The selection unit determines whether or not to select the priority base station as the interlocking base station based on a time during which the position of the communication terminal is within a predetermined range from a predetermined position.
The base station according to claim 6. The information acquisition unit acquires second radio wave state information indicating a state of a radio wave received by the communication terminal from the base station,
The selection unit selects the linked base station based on a relationship between a first radio wave state indicated by the first radio wave state information and a second radio wave state indicated by the second radio wave state information;
The base station as described in any one of Claim 1 to 7. The selection unit selects a priority base station in which a difference between a radio wave intensity indicated by the first radio wave state information and a radio wave intensity indicated by the second radio wave state information is within a predetermined threshold
The base station according to claim 8. The base station further includes a data transmission unit that transmits part of the data received from the network side apparatus to the linked base station.
The data transmission unit determines a data amount to be transmitted to the linked base station based on a relationship between the first radio wave state and the second radio wave state;
The base station according to claim 8 or 9. The computer runs,
The state of radio waves received by the communication terminal from one or more candidate base stations that are candidates for other base stations that perform carrier aggregation in conjunction with the base station from a communication terminal capable of communicating with a base station of a wireless communication network Obtaining first radio wave state information indicating the first radio wave state,
When a priority base station that includes a predetermined position in a communicable range is included in the one or more candidate base stations, and the first radio wave state corresponding to the priority base station satisfies a predetermined condition, the base station is linked. Selecting the priority base station as an interlocking base station that performs carrier aggregation,
A communication method comprising: A plurality of base stations of a wireless communication network, and a communication terminal capable of communicating with the wireless communication network,
The main base station, which is one of the plurality of base stations,
In a state of radio waves received by the communication terminal from one or more candidate base stations that are candidates for other base stations that perform carrier aggregation in conjunction with the main base station, from a communication terminal that can communicate with the main base station An information acquisition unit that acquires first radio wave state information indicating a first radio wave state;
When a priority base station that includes a predetermined position in a communicable range is included in the one or more candidate base stations, and the first radio wave state corresponding to the priority base station satisfies a predetermined condition, the base station is linked. A selection unit that selects the priority base station as a linked base station that performs carrier aggregation;
A communication control unit that distributes data received from a network side device and transmits the data to the priority base station and the communication terminal;
Have
The priority base station, when selected as the interlocking base station, transfers data addressed to the communication terminal received from the main base station to the communication terminal;
Communications system.

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